Fully gapped superconductivity in Ni-pnictide superconductors BaNi 2As2 and SrNi2P2

N. Kurita; F. Ronning; C. F. Miclea; Y. Tokiwa; E. D. Bauer; A. Subedi; D. J. Singh; H. Sakai; J. D. Thompson; R. Movshovich

doi:10.1088/1742-6596/273/1/012097

Fully gapped superconductivity in Ni-pnictide superconductors BaNi ₂As₂ and SrNi₂P₂

N. Kurita
, F. Ronning
, C. F. Miclea
, Y. Tokiwa
, E. D. Bauer
, A. Subedi
, D. J. Singh
, H. Sakai
, J. D. Thompson
, R. Movshovich

MST-8, Los Alamos National Laboratory
National Institute for Materials Science
Georg-August-Universität Göttingen
Oak Ridge National Laboratory
University of Tennessee
Japan Atomic Energy Agency

Research output: Contribution to journal › Article › peer-review

Abstract

We have performed low-temperature specific heat C and thermal conductivity κ measurements on the Ni-pnictide superconductors BaNi₂As ₂ (T_c = 0.7K) and SrNi₂P₂ (T _c = 1.4K). The temperature dependences C(T) and κ(T) of the two compounds are similar to the results of a number of s-wave superconductors. Furthermore, the concave field responses of the residual κ for BaNi ₂As₂ rules out the presence of nodes on the Fermi surfaces. We postulate that fully gapped superconductivity could be universal for Ni-pnictide superconductors. Specific heat data on Ba_0.6La _0.4Ni₂As₂ shows a mild suppression of T _c and H_c2 relative to BaNi₂As₂.

Original language	English
Article number	012097
Journal	Journal of Physics: Conference Series
Volume	273
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/273/1/012097
Publication status	Published - 1 Jan 2011
Externally published	Yes

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10.1088/1742-6596/273/1/012097

Cite this

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title = "Fully gapped superconductivity in Ni-pnictide superconductors BaNi 2As2 and SrNi2P2",

abstract = "We have performed low-temperature specific heat C and thermal conductivity κ measurements on the Ni-pnictide superconductors BaNi2As 2 (Tc = 0.7K) and SrNi2P2 (T c = 1.4K). The temperature dependences C(T) and κ(T) of the two compounds are similar to the results of a number of s-wave superconductors. Furthermore, the concave field responses of the residual κ for BaNi 2As2 rules out the presence of nodes on the Fermi surfaces. We postulate that fully gapped superconductivity could be universal for Ni-pnictide superconductors. Specific heat data on Ba0.6La 0.4Ni2As2 shows a mild suppression of T c and Hc2 relative to BaNi2As2.",

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T1 - Fully gapped superconductivity in Ni-pnictide superconductors BaNi 2As2 and SrNi2P2

AU - Kurita, N.

AU - Ronning, F.

AU - Miclea, C. F.

AU - Tokiwa, Y.

AU - Bauer, E. D.

AU - Subedi, A.

AU - Singh, D. J.

AU - Sakai, H.

AU - Thompson, J. D.

AU - Movshovich, R.

PY - 2011/1/1

Y1 - 2011/1/1

N2 - We have performed low-temperature specific heat C and thermal conductivity κ measurements on the Ni-pnictide superconductors BaNi2As 2 (Tc = 0.7K) and SrNi2P2 (T c = 1.4K). The temperature dependences C(T) and κ(T) of the two compounds are similar to the results of a number of s-wave superconductors. Furthermore, the concave field responses of the residual κ for BaNi 2As2 rules out the presence of nodes on the Fermi surfaces. We postulate that fully gapped superconductivity could be universal for Ni-pnictide superconductors. Specific heat data on Ba0.6La 0.4Ni2As2 shows a mild suppression of T c and Hc2 relative to BaNi2As2.

AB - We have performed low-temperature specific heat C and thermal conductivity κ measurements on the Ni-pnictide superconductors BaNi2As 2 (Tc = 0.7K) and SrNi2P2 (T c = 1.4K). The temperature dependences C(T) and κ(T) of the two compounds are similar to the results of a number of s-wave superconductors. Furthermore, the concave field responses of the residual κ for BaNi 2As2 rules out the presence of nodes on the Fermi surfaces. We postulate that fully gapped superconductivity could be universal for Ni-pnictide superconductors. Specific heat data on Ba0.6La 0.4Ni2As2 shows a mild suppression of T c and Hc2 relative to BaNi2As2.

U2 - 10.1088/1742-6596/273/1/012097

DO - 10.1088/1742-6596/273/1/012097

M3 - Article

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VL - 273

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012097

ER -

Fully gapped superconductivity in Ni-pnictide superconductors BaNi 2As2 and SrNi2P2

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Fully gapped superconductivity in Ni-pnictide superconductors BaNi ₂As₂ and SrNi₂P₂